THU al-QIDAH or, QADAH both diacritical marks are valid.
The first of the four Prohibited Months, when people sit-down (fr. quud, v. TO SIT) to rest from tribal conflict. The Arabs also called this month Warnah  fr. tawarrun, akin to tawaddun, FRAGRANCE and GRACE; and Rubbah  syn. Jamaah, UNITY or SOLIDARITY; likewise, it is also called, Jayfal  fr. al-jafala MASSES, and other names.

LUMINARIES

Dates for Some Luminaries of Blessed Memory who were either born or passed away during the month of Thu al-Qidah or, Qadah.

Abu al-Husayn Ibn Mu ti, Yahya b. Abd al-Mu ti b. Abd al-Nur al-Zwawi al-Hanafi passed away in Thu al-Qidah (628/September 1231) the Imam of Arabic who authored the Alfiyyah that Imam Abu Abd-Allah Ibn Malik (598-672/1202-1273) referred to in the beginning of his own Alfiyyah, as having had the virtue of precedence ( fadhl al-sabq). With due reverence and neither denial nor rebuttal, it should be noted that Imam Ahmad b. al-Mansur b. al-Agharr al-Yashkuri al-Dinawari (370/980) authored a poem in Arabic grammar (three centuries prior to Ibn Mu ti) that contained 2,911 verses. Its introduction alluded to numerous similar works of varying length that also preceeded it.

Zaynab bint Yahya b. Sultan al-Ulama`, Abd al-Aziz b. Abd al-Salam al-Sulami also passed in Thu al-Qidah (735/July 1335). Along with her grandfathers works, on her authority we also narrate al-Mujam al-Saghir of Tabarani, the Juz` of al-Hasan b. Arafah and numerous smaller hadith collections. She was born (648/1250).

Queen Dilshad bint Dimashq Khwaja b. Joban ruled over the affairs of Iraq in her era. Her husband was viceroy. She also passed away in Thu al-Qidah (752/January 1352). Dilshad is Persian for joyful heart.